def AddResults(self, tab, results):
absolute_browser_main_entry_ms = self._GetBrowserMainEntryTime(tab)
process_creation_to_window_display_ms = histogram_util.GetHistogramSum(
histogram_util.BROWSER_HISTOGRAM, 'Startup.BrowserWindowDisplay', tab)
absolute_foreground_tab_loaded_ms, absolute_all_tabs_loaded_ms = \
self._GetTabLoadTimes(tab.browser)
process_creation_to_messageloop_start_ms = histogram_util.GetHistogramSum(
histogram_util.BROWSER_HISTOGRAM, 'Startup.BrowserMessageLoopStartTime',
tab)
main_to_messageloop_start_ms = histogram_util.GetHistogramSum(
histogram_util.BROWSER_HISTOGRAM,
'Startup.BrowserMessageLoopStartTimeFromMainEntry',
tab)
process_creation_to_main = (process_creation_to_messageloop_start_ms -
main_to_messageloop_start_ms)
# User visible.
results.Add('process_creation_to_window_display', 'ms',
process_creation_to_window_display_ms)
results.Add('process_creation_to_foreground_tab_loaded', 'ms',
absolute_foreground_tab_loaded_ms -
absolute_browser_main_entry_ms + process_creation_to_main)
results.Add('process_creation_to_all_tabs_loaded', 'ms',
absolute_all_tabs_loaded_ms -
absolute_browser_main_entry_ms + process_creation_to_main)
# Critical code progression.
results.Add('process_creation_to_main', 'ms',
process_creation_to_main)
results.Add('main_to_messageloop_start', 'ms',
main_to_messageloop_start_ms)
def _GetBrowserMainEntryTime(self, tab):
"""Returns the main entry time (in ms) of the browser."""
histogram_type = histogram_util.BROWSER_HISTOGRAM
high_bytes = histogram_util.GetHistogramSum(
histogram_type, 'Startup.BrowserMainEntryTimeAbsoluteHighWord',
tab)
low_bytes = histogram_util.GetHistogramSum(
histogram_type, 'Startup.BrowserMainEntryTimeAbsoluteLowWord', tab)
if high_bytes == 0 and low_bytes == 0:
return None
return (int(high_bytes) << 32) | (int(low_bytes) << 1)